Band resaw-machine.



No. 833,538. 1 PATENTBD OCT. 16, 1906.

E. c. MERSHON.

BAND RESAW MACHINE.

APPLICATION FILED nuns. 1905.

3 SHEETS-SHEET 2.

I E L INVENTOH E. mars/lam ,4 TTOR/VEYS 1H2 NORRIS PETERS co.,WASHINGTON. n. c.

conformation of the wor PATENT OFFICE.

UNITED STATES EDWARDC. MERSHON, or SAGINAW, MICHIGAN.

BAND RESAW-M'AQCHINE.

Patented. Oct. 16, 1906.

Application filed January 18,1905. Serial No. 241,533.

Be it known that I, EDWARD C. MERSHON,

a citizen of the United States, and a resident of Saginaw, in the countyof Saginaw and State of Michigan, (with post-ofiice address Saginaw,Michigan,) have invented certain new and useful Improvements in Band'Resaw-Machines, of which the following is a I specification.

The present invention relates to sawingmachines, and more particularlyto the means for guiding the saw-blade- The invention is particularlyuseful for band-saw machines, and for that reason the invention is shownin the accompanying drawings as applied to'a machine of that class.

The invention relates, rimarily, to the king face of the guide, or, inother words, the face which is in contact with the saw-blade; and theinvention consists in providing the working face with refuse-receivingpockets or receptacles adapted to receive lumps of pitch, gum, sawdust,&c., which would otherwise come between theface of the guide'and thesurface of the saw-blade and would thereby cause sudden jars. and strainto the bladeor make the same flutter or vibrate, thereby tending toproduce crystallization of the blade.

'le my invention is useful for sawguides of any description, it isespecially use ful and especially effective for machines in which theguide consists of a wheel and in which said wheel or wheels are employedas crowding-wheels, by whose lateral adjustment the plane of thatportion ofthesaw I which does the cutting may be varied.

In carrying out my invention Iv prefer to make the refuse-holdingrecessesor pockets on the working face of the guide or guidewheel followthe circumferential line of the periphery, thus producing a wheelwhichhas a number of annular grooves cut in the working face thereof andwith intermediate narrow ridges or rings which engage the surface of thesaw-blade. When the working face. is

thus formed, the pressure of the saw exerted against the narrow ridgesor rings instead of cementing the pitch and sawdust to the circumferenceof the guide-wheel, as it would do in the case of a wheel whose surfaceis fiat or unbroken, acts to press such refuse down intothe grooves or.recesses, whence, owing to "line of the working face, but might usegrooves the direction of which forms a more or less acute angle withthe'true circumference. Thus, for instance, said grooves might bediagonal or spiral grooves across the face of the wheel at an angle offorty-five degrees, more or less, or might consist of numerous milledpockets orrecesses therein, the only requirement being that there shallbeno break in the circular line of the circumference of the wheel, suchas would interrupt or vary the continuity of contact of the surface ofthe saw by a pressure device acting continuously in the circumference ofa true circle. In other words, there must be no interruption in thecontinuity of the pressure by the working face of the wheel, sinceotherwise there would be a tendency to vibration. Hence grooves milledparallel to the axis of rotation of the wheel would not be suitable, forthey would cause a fluttering of the'saw, whereas theobject of myinvention is to cause the saw to run with approximatelythe samesmoothness as it would run if engaged by a wheel having a perfectlysmooth or unbroken periphery under the best conditionsthat isto say,without the presence'at any'timeof foreign material between theengagingsurfaces or pointsof the guide-wheel and saw, respec- 'Anotheradvantage secured by my invention is the doing away with any possibleaircushion between the saw and guide due to the rapid revolving of thewheels and travel of the saw.

My invention further relates to the manner of mounting and adjusting theposition of guide-wheels used as crowding-wheels to'determine theposition of the lane'of that porconsists in the novelfeaturesand'detail's of construction hereinafter described and thenspecified in the claims. I j j In the accompanyingdrawings, Figure l isa rear elevation of aband-saw machine equipped With saw-guides orcrowding-wheels constructed in accordance with my inven Fig. 2 is asectional view taken on the" tion. line A B, 3, vertically through oneof said wheelsand its supporting parts. Fig. 3

is a somewhat-enlarged detail view of one of said wheels as seen fromthe rear. Fig. 4 represents a portion of the face of a wheel in whichthe refusereceiving pockets or recesses are diagonal to thecircumference of revolution. Fig. 5 shows a modified construction of thewheel. Fig. 6 is a plan of the wheel and its mounting. Fig. 7 is adiagram showing the relation of the guide-wheel to the saw and fence.

Referring to the drawings, S indicates the band-saw traveling onsuitable wheels, as usual in the art, one of which is shown as providedwith suitable means for adjusting its position to adjust the tension onthe traveling band.

G indicates the usual fence or guide against which the material to besawed is held by the driven yielding pressure-roll H in the usualmanner.

0 C indicate guide-wheels which take the place of the usual saw-guideand are so mounted and applied to the saw that by suitable adjustment oftheir positions laterally the plane of that portion of the saw whichdoes the cutting may be changed.

In the periphery or working face of each wheel are formed a number ofannular grooves, as indicated more clearly in the sectional view, Fig.2, and these grooves are separated by narrow ridges or rings thecircumference of which engages and acts upon the saw to hold it in therequired position. For the best results the width of each engagingsurface should be as narrow as practicable, so as to afford littlesurface for imprisoning any foreign material between it and the surfaceof the saw, the general object being to remove as much of the peripheryin contact with the saw as possible, while at the same time afiording auniform or continuous engagement of the wheel and saw in thecircumference of the circle or cylinder to which the saw is alwaystangent. As indicated in Fig. 4, the grooves or recesses and the ridgesor engaging portions might be diagonal to the circumference ofrevolution.

As shown in Fig. 5, the wheel might be constructed from a number ofcircular steel plates Q, similar to the disks of an ordinary circularsaw, but without teeth, and separated from one another by collars orwashers R, all clamped together on the shafts, so as to provide two,three, or more disks operating together as a crowding-wheel, in whichthe spaces between the disks constitute the refuse-receiving recesses.

N is a suitable plate or block furnished with journal-bearings for theshaft of the wheel or guide C. Each guide-wheel is mounted on a suitableshaft turning in bearings carried by asupporting plate or block N, andthe latter in turn is supported by a plate or carrier 0, which issuitably mounted so as to be capable of adjustment in a direction towardor away from the saw. The said line of the shaft carrying the guidewheelis transverse to the line of adjustment of the carrier 0. The adjustmentof the carrier O, and hence of the wheel, toward and away fromthe sawmay be effected by any suitable meansas, for instance, by the screw F orF turning in suitable bearings in the bracket or support M and engaginga nut P, secured to the carrier 0. The latter is suitably guided in thebracket M, and said bracket is preferably carried by a frame or tableconsisting of a slide M, guided on the frame of the machine andvertically adjustable thereon by any suitable means-as, for instance, bya screw D, operated by handwheel E. By means of screwsF F thecrowding-wheels may be adjusted bodily against the saw to vary theposition of the cutting portions of the saw with relation to thepressureroll H and fence G. By the screw D the upper crowding-wheel maybe elevated to admit of the passage of wider stock through the machine,and likewise may be lowered when narrow stock is passing through themachine, as it is desirable to support the saw as close to the cuttingportion thereof as is practicable. As will be obvious, eitheradjustmentnamely, that in a direction toward the saw or that in adirection substantially parallel to the line of the cutting portionmaybe eflected without disturbing the other. I also mount thejournal-bearing block or support N on the adjustable carrier 0 in suchmanner as to provide for a tilting of the axis of the crowding or guidewheel in a vertical plane or plane parallel to the plane of the workingor cutting portion of the saw. By this means it becomes possible tocorrect any deviation of the axis of the crowding-wheel from a planehorizontally parallel with the planes occupied by the axis of the upperand lower main band-wheel shafts and to control to a certain extent theposition that the saw will occupy on the wheels of the machine. Thusshould the axis be tilted so as to depress the end opposite the rearedge of the saw-blade the saw would be caused to advance on the mainband-wheels of the machine, and should said end be elevated a recedingor backward movement of the saw on said main band-wheels will result.

The plate or support N may be mounted to rock on the carrier 0, so as totilt the wheel in any suitable way-as, for instance, by sustaining it ona rocking bearing n at one end. Adjusting and set screws I I or otherdevices mounted, preferably, on the carrier 0 engage the other end andserve to adj ustably tilt the plate or support, and thereby tilt thecrowding-wheel at any position of lateral adjust- -ment of the carrier 0with relation to the saw-blade. The support N is held down to itsrocking bearing by means of the bolt T or other suitable means. ,Eachcrowding or guide wheel is also mounted or supported in such way as tobe capable of adjustment in a manner to turn or swing on its axis in ahorizontal plane or plane substantially perpendicular to the plane ofthe portion of the sawblade against which it bears. For this purpose Iprefer to mount the part N, upon which it is directly supported, in suchway as to be capable of turning in said perpendicular plane. To permitthis turning movement, the bolt I works in a slightly-elongated opening(not shown) in the carrier 0, and the bolt T serves as a pivot when theadjustment is effected by the pair of set-screws W, mounted in thecarrier 0 and engaging the opposite sides of the plate N or by othersuitable means. The-purpose of this adjustment is as follows: Itsometimes happens that a sawblade is not so sharpened or set that thetwo sides of the blade are exactly uniform. Thus if the saw has less seton the side next the press-roll H than on the other side the timberpassing through the machine may press the saw-blade toward the fence G,because of insufiicient clearance between the saw-blade and that portionof the timber lying between the saw and said press-roll H. Moreover,band-saws are very sensitive and require to be hammered or rolled, so asto expand certain portions of the metal and cause the tension strain ofthe wheels to be exerted toward the edges of the saw. This treatment ofthe blade by means of hammering on an anvil or by passing it betweenhardened-steel rolls may result in the saw-blade becoming convex orconcave in certain portions in place of being perfectly fiat and true,and when in this condition the tendency is for the saw to lead or becrowded in the direction of its concave side. Alimited amount ofimperfection of the saw blade or plate because of improper rolling orhammering or because of improper sharpening or setting may be overcome bcross-lining (as it is technically described) the crowding-wheels in ahorizontal direction. With the saw-blade properly sharpened, set, andhammered the face of the crowding-wheel in contact with the saw shouldbe tangent to a vertical plane exactly parallel with the face of thefence G. With the saw hammered concave on the side toward G or havinginsufficient set on the side next the press-roll, so that there isinsuflicient clearance between the same and the roll, there would be atendency to press the saw-blade toward the fence. The crowdingwheelsshould then be alined so that that portion of the crowding-wheel whichpresses against the saw-blade near the toothed edge should be slightlyfarther from the plane of the guiding-face of the fence G than thatportion of the crowding-wheel which engages and supports the band-sawblade at its back edges.

In the diagram, Fig. 7, the line G G represents the face of the fence G.The curved line S represents the saw, of which the face next to thefence G is concave. Now it is always the toothed edge of the saw-bladewhich guides the saw, and thus to present the toothed edge ofthe saw Tproperly to the material being sawed that portion of the saw between Tand Q must be practically parallel with the line G G. This of coursewill necessitate the cross-lining of the crowding-wheels, so that thegeneral position of the face of said crowding-wheels in said contactwith the saw occupies the position H H.

In the foregoing specification I have described a lateral adjustment ofthe wheel; but it is to be understood that the term is used withreference to the side of the saw and applies both to an arrangement inwhich the cutting portion of the blade is vertical and to an arrangementin which the blade is horizon, tal, in which case the lateral adjustmentor adjustment to and from the side of the sawblade would be in avertical instead of a horizontal plane.

What I claim as my invention is 1. A revolving saw-guide havingrefuse-receiving recesses extending circumferentially around its workingface and separated by narrow ridges that engage the surface of the saw.

2. A revolving saw-guide having a working face provided'withrefuse-receiving pockets separated by narrow ridges that engage thesurface of the saw.

3. The combination with a band-saw of a crowding-wheel provided withrefusereceiving grooves on its working face separated by narrow ridgesor projections so disposed as not to break the continuity of the workingcircumference of contact between the wheel and saw, as and for thepurpose described.

4. The combination with a band-saw of a crowding-wheel provided withpockets or recesses and intermediate ridges or projections adapted tosupport the saw at all times at some point on a line across the sawwhere it is a tangent to the periphery of the working face 0 the wheel.

5. In a band-saw machine, a guide-wheel bearing laterally against thecutting portion of the saw and mounted in a vertically-tiltable supportcombined with means for adjustin said support so as to swing the axis ofthe wIieel in a plane perpendicular to the plane of the saw-blade, asand for the purpose described.

6. In a band-saw the combination with a guide-wheel bearing laterallyagainst the saw- Signed at Saginaw, in the county of Sagiblade of meansfor tilting the axis of the naw and State of Michigan, this 3d day ofwheel in a plane parallel to the saw, means January, A. D. 1905.

for swinging the axis of the wheel in a plane EDWARD O. MERSHON. 5transverse to the blade of the saw and means Witnesses:

for adjusting said wheel bodily toward and B. C. BINGHAM,

away from the saw. CLAYTON BROWN.

